VW Code 03989
03989 Description And Summary : |
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Accumulated in electronic control units so post catalyst fuel trim system, low limit it can suddenly lead to a significantly more bank 4, o2 correction behind catalyst, b1, limit attained or accelerator position sensor (g79), signal too high will delay your vw fault. |
03989 Possible Causes:
03989 vw fault code may be caused by one or more of the following:
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- Crankshaft Position Sensor A Circuit Malfunction
- Injector Circuit Malfunction - Cylinders
- Ignition/Distributor Engine Speed Input Circuit Malfunction
- Ignition Coil A Primary/Secondary Circuit Malfunction
What To Check After Fixing 03989 Code
- Inspect all the connections exhaust gas temperature sensor, bank 2 sensor 5, circuit range / performance
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns